Should Guys Put the Toilet Seat Down After Using it Every Time?

Not some of the times. Every time. In a house/toilet room used equally by both genders.
Should the guys have to put the seat down after using it?
If no, is there ever a point when guys should? What kind of Female:Male use ratio?

Key word here is "should", as in 'a social expectation'.

My thoughts:

 Spoiler

Frequent arguments for "yes":

"Girls could come in in the middle of the night and fall into the bowl!"
-Rooms have lights, use them.
-Girls have eyes, use them. It takes half a second to check if the seat's up
-Use the bathroom before you go to bed. Been taught this since we're 5 to avoid bed wetting.

"It's just common courtesy"
-Q:"Why should guys have to put it up"
Your A:"They just should"
No.

It's just hypocritical for women to complain about how men are sexist, when they turn around and do stuff like this. Is the world going to end because I have to listen to women complaining about the toilet seat? No. Doesn't make it less annoying.
@yes answers, Why shouldn't women put the seat up for guys if they want to avoid pee-splattered seats?